(a)the construction, repair and maintenance of all public roads in the Panchayat Union which are classified as Panchayat Union roads and of all bridges, culverts, road-dams and cause-ways on such roads;(aa)[ the excavation, repair and maintenance of tanks and the construction of water works for the supply of water for drinking, washing and bathing purposes. [Substituted by Tamil Nadu Panchayats (Amendment) Act, 2009 (Tamil Nadu Act 28 of 2009).](aaa)[ the construction and maintenance of comprehensive water supply schemes for the supply of protected drinking water covering one or more Village Panchayats as may be notified by the Government;]